This is a render of the network that acts as the opponent in the game.
(The Green links represent excitatory synapses, the red inhibitory )

It is a feed-forward perceptron network and was trained with Backprop, (On a util of my own creation).

The 21 blue balls at the top of the structure represent the input neurons.
The shape of this input periphery is passed across the Connect4 board like a template and
the network's evaulation of each column is collected from a single output neuron at the bottom.